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% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 7.5.5, p. I-249.
% Original source in file "vboxes1.TEX", starting line 2107.
\wlog{L: "vcentx.tip" ["vboxes1.TEX," l. 2107, p. I-249]}%
% This file DOES belong to format "texip."
\catcode`\@ = 11
\newbox\@VcenterXBox
\newdimen\@VcenterDimen
\def\VcenterX{%
\hbox\bgroup
\mathsurround = 0pt
\futurelet\@VCenterXToken\@VCenterXA
}
\def\@VCenterXA{%
\ifx\@VCenterXToken\bgroup
\let\@VcenterXNext = \@VcenterXOrdinary
\else
\ifx\@VCenterXToken t%
\let\@VcenterXNext = \@VcenterXTo
\else
\let\@VcenterXNext = \@VcenterXSpread
\fi
\fi
\@VcenterXNext
}
\def\@VcenterXOrdinary{%
\def\@VcenterCommand{\vcenter}%
\afterassignment\@VcenterXB
\let\@VcenterDrop =
}
\def\@VcenterXTo to{%
\def\@VcenterCommand{to}%
\afterassignment\@VcenterXToSpread
\@VcenterDimen =
}
\def\@VcenterXSpread spread{%
\def\@VcenterCommand{spread}%
\afterassignment\@VcenterXToSpread
\@VcenterDimen =
}
\def\@VcenterXToSpread{%
\edef\@VcenterCommand{%
\vcenter\@VcenterCommand \the\@VcenterDimen
}%
\afterassignment\@VcenterXB
\let\@VcenterDrop =
}
\def\@VcenterXB{%
\setbox\@VcenterXBox = \hbox\bgroup
$%
\@VcenterCommand\bgroup
\aftergroup\@VcenterXC
}
\def\@VcenterXC{%
$%
\egroup
\box\@VcenterXBox
\egroup
}
\catcode`\@ = 12
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